Performance of High Strength and Low Thermal Conductivity Foamed Concrete

Abstract

Abstract: In engineering practice, as the wall material of prefabricated buildings, this wall material not only requires better thermal insulation performance, but also meets certain mechanical properties requirements. Light foamed concrete is a good choice for this wall material. But the mechanical properties of light foamed concrete are often poor when it meets the thermal properties requirements. A preparation method of high strength and low thermal conductivity foamed concrete was proposed. The effects of water-binder ratio, foam content, fly ash content and polypropylene (PP) fiber content on the compressive strength and thermal conductivity of foamed concrete were studied through mix ratio experiment. In view of scanning electron microscope (SEM) of foamed concrete, the influences of fly ash and PP fiber on compressive strength and thermal conductivity of foamed concrete are revealed. The results show that when the water-binder ratio is 0.6, the content of foam is 4% (mass fraction, the same below), the content of fly ash is 25% and the content of PP fiber is 0.2%, the foamed concrete has higher compressive strength and lower thermal conductivity.

Key words: foamed concrete, fly ash, polypropylene fiber, compressive strength, thermal conductivity

CLC Number:

TU528.2

ZHOU Xuejun, XIAN Guodong, WANG Zhen, LIU Zhe, WANG Xingbo, WANG Weidong. Performance of High Strength and Low Thermal Conductivity Foamed Concrete[J]. BULLETIN OF THE CHINESE CERAMIC SOCIETY, 2021, 40(4): 1186-1192.

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